[Issue-3349] Handle absolute surefire tempDir on Windows

maven-surefire-common/src/main/java/org/apache/maven/plugin/surefire/AbstractSurefireMojo.java

@@ -455,11 +455,12 @@ public abstract class AbstractSurefireMojo extends AbstractMojo implements Suref
     private boolean failIfNoTests;
 
     /**
-     * Relative path to <i>temporary-surefire-boot</i> directory containing internal Surefire temporary files.
+     * Path to <i>temporary-surefire-boot</i> directory containing internal Surefire temporary files.
      * <br>
      * The <i>temporary-surefire-boot</i> directory is <i>project.build.directory</i> on most platforms or
      * <i>system default temporary-directory</i> specified by the system property {@code java.io.tmpdir}
      * on Windows (see <a href="https://issues.apache.org/jira/browse/SUREFIRE-1400">SUREFIRE-1400</a>).
+     * Absolute paths and relative paths with directory separators are used as explicit directories on all platforms.
      * <br>
      * It is deleted after the test set has completed.
      *
@@ -3361,13 +3362,28 @@ File createSurefireBootDirectoryInBuild() {
     }
 
     File createSurefireBootDirectoryInTemp() {
+        String tempDir = getTempDir();
+        if (isTempDirPath(tempDir)) {
+            File tmp = new File(tempDir);
+            if (!tmp.isAbsolute()) {
+                tmp = new File(getProjectBuildDirectory(), tempDir);
+            }
+            //noinspection ResultOfMethodCallIgnored
+            tmp.mkdirs();
+            return tmp;
+        }
+
         try {
-            return Files.createTempDirectory(getTempDir()).toFile();
-        } catch (IOException e) {
+            return Files.createTempDirectory(tempDir).toFile();
+        } catch (IOException | IllegalArgumentException e) {
             return createSurefireBootDirectoryInBuild();
         }
     }
 
+    private static boolean isTempDirPath(String tempDir) {
+        return new File(tempDir).isAbsolute() || tempDir.indexOf('/') >= 0 || tempDir.indexOf('\\') >= 0;
+    }
+
     @Override
     public String getLocalRepositoryPath() {
         return Optional.ofNullable(

maven-surefire-common/src/test/java/org/apache/maven/plugin/surefire/AbstractSurefireMojoTest.java

@@ -816,6 +816,21 @@ public void shouldExistTmpDirectory() throws IOException {
                 .isDirectory();
     }
 
+    @Test
+    public void shouldUseAbsoluteTmpDirectory() throws IOException {
+        File targetDir = Files.createTempDirectory(tempFolder, "target").toFile();
+        File absoluteTempDir = tempFolder.resolve("surefire-tmp").toFile();
+
+        Mojo mojo = new Mojo();
+        mojo.setProjectBuildDirectory(targetDir);
+        mojo.setTempDir(absoluteTempDir.getAbsolutePath());
+
+        File bootDir = mojo.createSurefireBootDirectoryInTemp();
+
+        assertThat(bootDir).isDirectory();
+        assertThat(bootDir.getCanonicalFile()).isEqualTo(absoluteTempDir.getCanonicalFile());
+    }
+
     @Test
     public void shouldSmartlyResolveJUnit5ProviderWithJUnit4() throws Exception {
         MavenProject mavenProject = new MavenProject();